Many Holyoke, Mass., residents are still surprised, and some even say they feel betrayed by Mayor Alex Morse. The 23-year-old Democrat who ran for mayor last year as an anti-casino candidate announced this week that he was considering a casino proposal for Mt. Tom. One long time, former Holyoke mayor — who is staunchly anti-casino — says it’s too soon to say what will happen to Morse’s political career once the dust settles.